Elasticsearch 1.7.3 发布分布式搜索引擎

Elasticsearch 1.7.3 发布，此版本是个 bug 修复版本，基于 Lucene 4.10.4，这是最新的稳定版本。

改进列表：

Synced flushes were reactivating inactive shards, thus reducing the size of the index buffer available to truly active shards. This could result in smaller segments than normal being written, which in turn causes more merging, and slower indexing on nodes with many inactive shards. (#13802, #13759)
Snapshot/Restore operations were being throttled excessively. (#13828)
Tribe nodes connected to slow clusters were holding onto old cluster states for too long, resulting in heavy memory usage. (#13948, #13566)
The analyzer, index_analyzer, and search_analyzer mapping settings were applied in indeterminate order, making a smooth transition to 2.0.0 difficult. (#14060)
The networking layer had a bug in its SSL handling, which has been fixed by upgrading to Netty 3.10.5. (#14105)